In a circle of radius 21 cm, an arc subtends an angle of 60^o at the centre. Find the area of sector formed by the arc.

Given:

Radius (r) = 21 cm

Angle subtended by arc (Ɵ) = 60^o

We know that,

⇒ Area of the sector = 11×21

⇒ Area of the sector = 231 cm²

Hence, Area of the sector = 231 cm²